Leslie, I have got it down as Bruce Anstey on a DTR Yamaha at 118.03 MPH for the fastest lap and the race average of 115.32 MPH and a race time of 1-18-31.1.
No doubt if this is not correct I will be blown away by the all the other old fogies.
That was in the TT of 2002 and you are of course aware that there was sadly no longer a 250TT from 2003 onwards. There is still a class for 250s in the Manx Grand Prix for at least next year that I know about.
Good luck and stay away from the gutters.